when loading a game , using this mod, with my brainless server, it's not activating.

the mod file is in the folder, but doesn't load. ( versions are ok, the same as on my client version of the game, where a created the save )

any other thing to do ?

Good question, are other mods loading?
Did you also add it to the "mod-list.json" file?
For example something like this:

{
"mods":
[

{
  "name": "base",
  "enabled": true
},

{
  "name": "RunningSpeed",
  "enabled": true
}

]
}

Thanks for your reply.

yes. it is. when i open the Json, to have a look, the mod isn't enabled. I change it to true, then save and launch the server. the mod isn't loading.

when opening again the Json, the mod is disabled again.

The save i use, have been created in multiplayer hosting, with a bunch of other mods. ( i use this mod list for solo games to. ) Among this dozen mods list, 2 of them aren't working with dedicated server : yours, and "TinyHaggis' Fast Tree Cutting"

maybe it can give you a clue ?

Try looking at the factorio-current.log file in the main directory, it can give a clue why the mod is getting disabled.

Another thing you could try, is to put all mods you want loaded in a directory and use the command line option --mod-directory, you can also try removing the mod-list.json with this command line option and and let the game auto generate it (you said the save file has it, so it should add it then)

There is this thread where they say deleting crop-cache.dat and data-cache.dat can also help, as there is caching.
https://forums.factorio.com/viewtopic.php?t=104705

Update: I tested making a new directory and copying all the mods in there (no mod-list.json), just mods, and then starting a headless server with --mod-directory and it loads this mod fine. Try this!

I gonna try this and let you know.

Thanks

Did it work?

sorry, didn't have to test before now :

the "--mod directory" method works.

if i let it select the directory by itself, it doesn't load your and another mod.

thanks for the tip !

Thanks for the feedback, I am glad it works now.